From: Vladislav Bolkhovitin <vst@vlnb.net>
To: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Cc: Tejun Heo <htejun@gmail.com>,
dougg@torque.net, Jeff Garzik <jeff@garzik.org>,
linux-ide@vger.kernel.org, linux-scsi@vger.kernel.org,
James Bottomley <James.Bottomley@SteelEye.com>,
djwong@us.ibm.com
Subject: Re: [PATCH 2/3] sd: implement START/STOP management
Date: Thu, 22 Mar 2007 18:14:44 +0300 [thread overview]
Message-ID: <46029D64.6040206@vlnb.net> (raw)
In-Reply-To: <20070322122940.GA29824@khazad-dum.debian.net>
Henrique de Moraes Holschuh wrote:
> On Thu, 22 Mar 2007, Vladislav Bolkhovitin wrote:
>
>>Seems, there is another way of doing a bank spin up / spin down: doing
>>it in two passes. On the first pass START_STOP will be issued with
>>IMMED=1 on all devices, then on the second pass START_STOP will be
>>issued with IMMED=0. So the devices will spin up / spin down in the
>>parallel, but synchronously, hence the needed result will be achieved
>
>
> And maybe trip the PSU's overcurrent defenses? There is a reason to default
> to sequential spin-up for disks...
But on spin down there is no such problem
> Of course, it can be user-selectable. But should it be the default?
>
prev parent reply other threads:[~2007-03-22 15:15 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-20 15:07 [PATCH 1/3] sd: fix return value of sd_sync_cache() Tejun Heo
2007-03-20 15:13 ` [PATCH 2/3] sd: implement START/STOP management Tejun Heo
2007-03-20 15:25 ` [PATCH 3/4] libata: reimplement suspend/resume support using sdev->manage_start_stop Tejun Heo
2007-03-20 15:29 ` Christoph Hellwig
2007-03-21 7:05 ` [PATCH scsi-misc-2.6] SCSI: kill sht->suspend/resume Tejun Heo
2007-03-21 14:19 ` Christoph Hellwig
2007-03-21 15:16 ` James Bottomley
2007-05-14 15:52 ` Tejun Heo
2007-03-20 15:55 ` [PATCH 4/4] libata: implement libata.spindown_compat Tejun Heo
2007-04-17 14:45 ` Jeff Garzik
2007-04-17 15:01 ` James Bottomley
2007-04-17 15:20 ` Jeff Garzik
2007-04-17 15:26 ` James Bottomley
2007-04-17 17:09 ` Tejun Heo
2007-04-17 17:33 ` James Bottomley
2007-03-20 16:39 ` [PATCH 3/4] libata: reimplement suspend/resume support using sdev->manage_start_stop Alan Cox
2007-03-20 16:15 ` Oliver Neukum
2007-03-20 16:58 ` [PATCH 2/3] sd: implement START/STOP management James Bottomley
2007-03-20 17:08 ` Tejun Heo
2007-03-20 17:26 ` James Bottomley
2007-03-21 3:42 ` Tejun Heo
2007-03-20 17:58 ` Douglas Gilbert
2007-03-20 18:41 ` James Bottomley
2007-03-21 2:35 ` Tejun Heo
2007-03-22 10:21 ` Vladislav Bolkhovitin
2007-03-22 12:29 ` Henrique de Moraes Holschuh
2007-03-22 15:14 ` Vladislav Bolkhovitin [this message]
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